Power divider circuit, power divider and design method of power divider circuit

Abstract

The embodiment of the present invention discloses a power divider circuit, a power divider and a design method of a power divider circuit. The power divider circuit includes: at least two transmission line branches; the first ends of the at least two transmission line branches are electrically connected to the input end of the power divider circuit, and the second ends of each of the transmission line branches are electrically connected to at least two output ends of the power divider circuit in a one-to-one correspondence; at least one of the transmission line branches includes a transmission line circuit, and the transmission line circuit includes: a first coupling inductor, a second coupling inductor, a series capacitor and a parallel capacitor, and the first coupling inductor and the second coupling inductor are mutually coupled. The embodiment of the present invention can achieve a small size of the power divider circuit and a harmonic suppression effect.

Description

Technical Field

[0001] The embodiments of the present invention relate to power divider technology, and more particularly to a power divider circuit, a power divider, and a design method for a power divider circuit. Background Art

[0002] A power splitter is a device that splits an input signal into two or more outputs with equal or unequal energy. It can also combine the energy of multiple signals into one output, which is also called a combiner. Power splitters have important applications in RF and microwave systems.

[0003] However, existing power dividers have problems such as large size and inability to achieve harmonic suppression effects, which limits the further application of power dividers. Summary of the invention

[0004] The embodiments of the present invention provide a power divider circuit, a power divider, and a design method of the power divider circuit to achieve a small size of the power divider circuit and a harmonic suppression effect.

[0005] In a first aspect, an embodiment of the present invention provides a power divider circuit, the power divider circuit comprising: at least two transmission line branches; the first ends of the at least two transmission line branches are electrically connected to the input end of the power divider circuit, and the second ends of each of the transmission line branches are electrically connected to at least two output ends of the power divider circuit in a one-to-one correspondence; at least one of the transmission line branches comprises a transmission line circuit, the transmission line circuit comprises: a first coupling inductor, a second coupling inductor, a series capacitor and a parallel capacitor, the first coupling inductor and the second coupling inductor being mutually coupled; the first end of the first coupling inductor is electrically connected to the first end of the parallel capacitor and then electrically connected to the first end of the transmission line branch; the second end of the first coupling inductor is electrically connected to the first end of the series capacitor, and the second end of the series capacitor is grounded; the first end of the second coupling inductor is electrically connected to the second end of the parallel capacitor and then electrically connected to the second end of the transmission line branch, and the second end of the second coupling inductor is electrically connected to the first end of the series capacitor.

[0006] Optionally, the at least two transmission line branches include a first transmission line branch and a second transmission line branch; each of the transmission line branches includes a transmission line circuit.

[0007] Optionally, an isolation resistor is further included, wherein a first end of the isolation resistor is electrically connected to the second end of the first transmission line branch, and a second end of the isolation resistor is electrically connected to the second end of the second transmission line branch.

[0008] Optionally, the series capacitor, the parallel capacitor, the first coupled inductor, the second coupled inductor, and the series capacitor satisfy the following relationship:

[0009]

[0010] C S =QC P ;

[0011]

[0012]

[0013]

[0014] Among them, the Z apn is the preset characteristic impedance value of the transmission line branch, Q is the preset tuning coefficient value; C p is the capacitance value of the parallel capacitor, the C s is the capacitance value of the series capacitor; L is the inductance value of the first coupled inductor and the second coupled inductor; k is the coupling coefficient between the first coupled inductor and the second coupled inductor; Φ is the preset phase shift value of the transmission line branch; f is the operating frequency of the power divider circuit.

[0015] Optionally, the parallel capacitor is a variable capacitor.

[0016] In a second aspect, an embodiment of the present invention further provides a power divider, comprising the power divider circuit as described in the first aspect.

[0017] In a third aspect, an embodiment of the present invention further provides a design method for a power divider circuit, wherein the power divider circuit comprises: two transmission line branches, a first transmission line branch and a second transmission line branch; the first end of each of the transmission line branches is electrically connected to the input end of the power divider circuit, and the second end of each of the transmission line branches is electrically connected to two output ends of the power divider circuit in a one-to-one correspondence; each of the transmission line branches comprises a transmission line circuit, and the transmission line circuit comprises: a first coupling inductor, a second coupling inductor, a series capacitor and a parallel capacitor, and the first coupling inductor and the second coupling inductor are mutually coupled; the first end of the first coupling inductor is electrically connected to the first end of the parallel capacitor and then electrically connected to the first end of the transmission line branch; the second end of the first coupling inductor is electrically connected to the first end of the series capacitor, and the second end of the series capacitor is grounded; the first end of the second coupling inductor is electrically connected to the second end of the parallel capacitor and then electrically connected to the second end of the transmission line branch, and the second end of the second coupling inductor is electrically connected to the first end of the series capacitor;

[0018] The method comprises: determining an operating frequency of the power divider circuit, a preset characteristic impedance value, a preset phase shift value, and a preset tuning coefficient value of the first transmission line branch and the second transmission line branch;

[0019] The capacitance value of the parallel capacitor of the transmission line branch, the capacitance value of the series capacitor, the inductance values ​​of the first coupled inductor and the second coupled inductor, and the coupling coefficient between the first coupled inductor and the second coupled inductor are determined according to the characteristic impedance value, the preset phase shift value, the tuning coefficient value and a preset formula.

[0020] Optionally, the preset formula includes:

[0021]

[0022] C S =QC P ;

[0023]

[0024]

[0025]

[0026] Among them, the Z apn is the preset characteristic impedance value of the transmission line branch, Q is the preset tuning coefficient value; C p is the capacitance value of the parallel capacitor, the C s is the capacitance value of the series capacitor; L is the inductance value of the first coupled inductor and the second coupled inductor; k is the coupling coefficient between the first coupled inductor and the second coupled inductor; Φ is the preset phase shift value of the transmission line branch; f is the operating frequency of the power divider circuit.

[0027] Optionally, the characteristic impedance value of the first transmission line branch and the characteristic impedance value of the second transmission line branch are obtained by the characteristic impedance value of the input end of the power divider circuit, the power distribution ratio of the output power of the second transmission line branch to the output power of the first transmission line branch, and an impedance calculation formula.

[0028] Optionally, the impedance calculation formula is:

[0029]

[0030] Wherein, the Zapn1 is the characteristic impedance value of the first transmission line branch, the Zapn2 is the characteristic impedance value of the second transmission line branch, the η is the power distribution ratio of the output power of the second transmission line branch to the output power of the first transmission line branch; the Z 0 is the characteristic impedance value of the input end of the power divider circuit.

[0031] The technical solution of this embodiment adopts a power divider circuit including at least two transmission line branches; the first ends of at least two transmission line branches are electrically connected to the input end of the power divider circuit, and the second ends of each transmission line branch are electrically connected to at least two output ends of the power divider circuit in a one-to-one correspondence; at least one transmission line branch includes a transmission line circuit, and the transmission line circuit includes: a first coupling inductor, a second coupling inductor, a series capacitor and a parallel capacitor, and the first coupling inductor and the second coupling inductor are mutually coupled; the first end of the first coupling inductor is electrically connected to the first end of the parallel capacitor and then electrically connected to the first end of the transmission line branch; the second end of the first coupling inductor is electrically connected to the first end of the series capacitor, and the second end of the series capacitor is grounded; the first end of the second coupling inductor is electrically connected to the second end of the parallel capacitor and then electrically connected to the second end of the transmission line branch, and the second end of the second coupling inductor is electrically connected to the first end of the series capacitor. Since the overall size of the first coupling inductor, the second coupling inductor and the series capacitor are smaller than the size of the transmission line, in the case of low frequency, the size of the transmission line circuit in this embodiment is smaller than the size of the traditional transmission line, thereby reducing the size of the transmission line branch, and further reducing the size of the power divider circuit. Furthermore, by setting a parallel capacitor, the power matching of the power divider circuit at the harmonic frequency of the operating frequency can be suppressed, thereby achieving the effect of harmonic suppression. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 A schematic diagram of the circuit structure of a power divider circuit provided by an embodiment of the present invention;

[0033] Figure 2 A schematic diagram of a circuit structure of a transmission line circuit provided by an embodiment of the present invention;

[0034] Figure 3 A schematic diagram of a circuit structure in which a power divider circuit is electrically connected to a load provided by an embodiment of the present invention;

[0035] Figure 4 A flow chart of a power divider circuit design method provided by an embodiment of the present invention;

[0036] Figure 5 Insertion loss experiment result diagram provided by the embodiment of the present invention;

[0037] Figure 6 A graph showing the input return loss experimental results provided by an embodiment of the present invention;

[0038] Figure 7 This is a diagram of the output isolation experiment results provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0039] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0040] As mentioned in the background technology, the existing power dividers are large in size and cannot achieve the effects of harmonic suppression. After careful research, the applicant found that the reason for this technical problem is that the existing power dividers are generally implemented using transmission lines. The size of the transmission line is determined by the operating frequency of the power divider. In low-frequency scenarios, due to the long wavelength of the input signal, the size of the transmission line with the corresponding electrical length is large, which makes the size of the power divider large; and because the transmission line is periodic, the power divider also has a normal power matching effect at the harmonic frequency point of the target operating frequency, and cannot achieve the effect of harmonic suppression.

[0041] Based on the above technical problems, the present invention proposes the following solutions:

[0042] Figure 1 A schematic diagram of a circuit structure of a power divider circuit provided by an embodiment of the present invention, Figure 2 A schematic diagram of a transmission line circuit provided by an embodiment of the present invention, referring to Figure 1 and Figure 2 The power divider circuit 10 includes: at least two transmission line branches; the first ends of at least two transmission line branches are electrically connected to the input end 1 of the power divider circuit, and the second ends of each transmission line branch are electrically connected to at least two output ends of the power divider circuit in a one-to-one correspondence; at least one transmission line branch includes a transmission line circuit, and the transmission line circuit includes: a first coupling inductor 101, a second coupling inductor 102, a series capacitor 103 and a parallel capacitor 104, and the first coupling inductor 101 and the second coupling inductor 102 are mutually inductively coupled; the first end of the first coupling inductor 101 is electrically connected to the first end of the parallel capacitor 104 and then electrically connected to the first end of the transmission line branch; the second end of the first coupling inductor 101 is electrically connected to the first end of the series capacitor 103, and the second end of the series capacitor 103 is grounded; the first end of the second coupling inductor 102 is electrically connected to the second end of the parallel capacitor 104 and then electrically connected to the second end of the transmission line branch, and the second end of the second coupling inductor 102 is electrically connected to the first end of the series capacitor 103.

[0043] Specifically, the input end 1 of the power divider circuit is used to input the main signal of the signal, and the main signal is output from each output end of the power divider circuit through each transmission line branch to complete the power distribution function, and the sum of the power of the output signals of each output end of the power divider circuit is the same as the power of the input signal of the input end; in this embodiment, at least one transmission line branch includes a transmission line circuit, and the remaining transmission line branches in the power divider circuit can be composed of transmission lines; in this embodiment, the structure composed of the first coupling inductor 101, the second coupling inductor 102 and the series capacitor 103 can be equivalent to a transmission line, which has a certain characteristic impedance value. By adjusting the relevant parameters of the first coupling inductor, the second coupling inductor and the series capacitor, the characteristic impedance value of the transmission line branch can be determined, thereby completing the power distribution function corresponding to the power divider. Since the overall size of the first coupling inductor, the second coupling inductor and the series capacitor is smaller than the size of the transmission line, in the case of low frequency, the size of the transmission line circuit in this embodiment is smaller than the size of the traditional transmission line, thereby reducing the size of the transmission line branch, and then reducing the size of the power divider circuit. Furthermore, by providing the parallel capacitor 104, the power matching of the power divider circuit at the harmonic frequency of the operating frequency can be suppressed, thereby achieving the effect of harmonic suppression.

[0044] The technical solution of this embodiment adopts a power divider circuit including at least two transmission line branches; the first ends of at least two transmission line branches are electrically connected to the input end of the power divider circuit, and the second ends of each transmission line branch are electrically connected to at least two output ends of the power divider circuit in a one-to-one correspondence; at least one transmission line branch includes a transmission line circuit, and the transmission line circuit includes: a first coupling inductor, a second coupling inductor, a series capacitor and a parallel capacitor, and the first coupling inductor and the second coupling inductor are mutually coupled; the first end of the first coupling inductor is electrically connected to the first end of the parallel capacitor and then electrically connected to the first end of the transmission line branch; the second end of the first coupling inductor is electrically connected to the first end of the series capacitor, and the second end of the series capacitor is grounded; the first end of the second coupling inductor is electrically connected to the second end of the parallel capacitor and then electrically connected to the second end of the transmission line branch, and the second end of the second coupling inductor is electrically connected to the first end of the series capacitor. Since the overall size of the first coupling inductor, the second coupling inductor and the series capacitor are smaller than the size of the transmission line, in the case of low frequency, the size of the transmission line circuit in this embodiment is smaller than the size of the traditional transmission line, thereby reducing the size of the transmission line branch, and further reducing the size of the power divider circuit. Furthermore, by setting a parallel capacitor, the power matching of the power divider circuit at the harmonic frequency of the operating frequency can be suppressed, thereby achieving the effect of harmonic suppression.

[0045] Alternatively, if Figure 1 The at least two transmission line branches include a first transmission line branch APN 1 and APN 2 ; Each transmission line branch includes a transmission line circuit.

[0046] Specifically, Figure 1 As shown, the first transmission line branch APN 1 The second end of the second transmission line branch APN is electrically connected to the first output end 2 of the power divider circuit 10. 2 The second end of is electrically connected to the second output end 3 of the power divider circuit 10; the power divider circuit of this embodiment is a circuit corresponding to the Wilkinson power divider. By adopting transmission line circuits for both the first transmission line branch and the second transmission line branch, on the one hand, the size of the power divider circuit is further reduced, and on the other hand, the performance of harmonic suppression is further improved.

[0047] Optionally, Figure 3 A schematic diagram of a circuit structure of a power divider circuit electrically connected to a load provided in an embodiment of the present invention, referring to Figure 3 The power divider circuit further includes an isolation resistor 201, a first end of the isolation resistor 201 is electrically connected to the second end of the first transmission line branch, and a second end of the isolation resistor 201 is electrically connected to the second end of the second transmission line branch.

[0048] Specifically, the isolation resistor 201 can balance the two output ports of the first output terminal 2 and the second output terminal 3 of the power divider circuit on the one hand, and play an isolation role; on the other hand, when an open circuit or a short circuit occurs in one of the paths, the reflected power is absorbed by the isolation resistor. It should be noted that the first output terminal 2 of the power divider circuit 10 can be connected to the first load 202, and the second output terminal 3 can be connected to the second load 203. The first load 202 and the second load 203 affect the power distribution ratio of the output signals of the two output terminals of the power distribution circuit.

[0049] Optionally, the series capacitor, the parallel capacitor, the first coupled inductor, the second coupled inductor, and the series capacitor satisfy the following relationship:

[0050] C S =QC P ;

[0051]

[0052]

[0053]

[0054] Among them, Z apn is the preset characteristic impedance value of the transmission line branch, Q is the preset tuning coefficient value; C p is the capacitance value of the parallel capacitor, C sis the capacitance value of the series capacitor; L is the inductance value of the first coupled inductor and the second coupled inductor; k is the coupling coefficient between the first coupled inductor and the second coupled inductor; Φ is the preset phase shift value of the transmission line branch; f is the operating frequency of the power divider circuit.

[0055] Specifically, when determining the operating frequency f of the power divider circuit, the preset characteristic impedance value Z apn After the preset tuning coefficient Q and the preset phase shift value Φ, the capacitance value of the parallel capacitor, the capacitance value of the series capacitor, the inductance value of the first coupling inductor and the second coupling inductor, and the coupling coefficient can be determined by the above formula. The bandwidth of the power divider circuit can be adjusted according to the preset tuning coefficient Q. The larger the Q value, the smaller the bandwidth, and the smaller the Q value, the larger the bandwidth.

[0056] Optionally, the parallel capacitor is a variable capacitor.

[0057] Specifically, by setting the parallel capacitor as a variable capacitor, the preset tuning coefficient Q can be adjusted by adjusting the capacitance value of the parallel capacitor, thereby adjusting the bandwidth of the power divider circuit, thereby further expanding the application range of the power divider circuit.

[0058] The embodiment of the present invention further provides a power divider, including the power divider circuit provided by any embodiment of the present invention. Since it includes the power divider circuit provided by any embodiment of the present invention, it also has the same beneficial effects, which will not be described in detail here.

[0059] Figure 4 A flowchart of a power divider circuit design method provided by an embodiment of the present invention, referring to Figure 4 , the power divider design method includes:

[0060] Step S110, determining the operating frequency of the power divider circuit, the preset characteristic impedance value, the preset phase shift value and the preset tuning coefficient value of the first transmission line branch and the second transmission line branch;

[0061] Specifically, the power divider circuit includes: two transmission line branches, a first transmission line branch and a second transmission line branch; the first end of each transmission line branch is electrically connected to the input end of the power divider circuit, and the second end of each transmission line branch is electrically connected to the two output ends of the power divider circuit in a one-to-one correspondence; each transmission line branch includes a transmission line circuit, and the transmission line circuit includes: a first coupling inductor, a second coupling inductor, a series capacitor and a parallel capacitor, and the first coupling inductor and the second coupling inductor are mutually coupled; the first end of the first coupling inductor is electrically connected to the first end of the parallel capacitor and then electrically connected to the first end of the transmission line branch; the second end of the first coupling inductor is electrically connected to the first end of the series capacitor, and the second end of the series capacitor is grounded; the first end of the second coupling inductor is electrically connected to the second end of the parallel capacitor and then electrically connected to the second end of the transmission line branch, and the second end of the second coupling inductor is electrically connected to the first end of the series capacitor; when designing the power divider circuit, the operating frequency, the preset characteristic impedance value, the preset phase shift value and the preset tuning coefficient value of the first transmission line branch and the second transmission line branch can be determined according to the design requirements.

[0062] Step S120, determining the capacitance value of the parallel capacitor of the transmission line branch, the capacitance value of the series capacitor, the inductance values ​​of the first coupled inductor and the second coupled inductor, and the coupling coefficient between the first coupled inductor and the second coupled inductor according to the characteristic impedance value, the preset phase shift value, the tuning coefficient value and the preset formula.

[0063] Specifically, the transmission line branch in this embodiment is composed of a transmission line circuit, and the capacitance value of the parallel capacitor of the transmission line branch, the capacitance value of the series capacitor, the inductance value of the first coupling inductor and the second coupling inductor, and the coupling coefficient between the first coupling inductor and the second coupling inductor are determined, that is, all the parameters of the transmission line branch are determined, and then the design of the power divider circuit is completed. In this embodiment, since the overall size of the first coupling inductor, the second coupling inductor and the series capacitor is smaller than the size of the transmission line, under low frequency conditions, the size of the transmission line circuit in this embodiment is even smaller than the size of the traditional transmission line, thereby reducing the size of the transmission line branch, and then reducing the size of the power divider circuit. And by setting a parallel capacitor, the power matching of the power divider circuit at the harmonic frequency of the operating frequency can be suppressed, thereby achieving the effect of harmonic suppression.

[0064] Optionally, the preset formula includes:

[0065] C S =QC P ;

[0066]

[0067]

[0068]

[0069] Specifically, when determining the operating frequency f of the power divider circuit, the preset characteristic impedance value Z apn After the preset tuning coefficient Q and the preset phase shift value Φ, the capacitance value of the parallel capacitor, the capacitance value of the series capacitor, the inductance value of the first coupling inductor and the second coupling inductor, and the coupling coefficient can be determined by the above formula. The bandwidth of the power divider circuit can be adjusted according to the preset tuning coefficient Q. The larger the Q value, the smaller the bandwidth, and the smaller the Q value, the larger the bandwidth.

[0070] Optionally, the characteristic impedance value of the first transmission line branch and the characteristic impedance value of the second transmission line branch are obtained by the characteristic impedance value of the input end of the power divider circuit, the power distribution ratio of the output power of the second transmission line branch to the output power of the first transmission line branch, and an impedance calculation formula.

[0071] Specifically, the impedance calculation formula is:

[0072]

[0073] Wherein, Zapn1 is the characteristic impedance value of the first transmission line branch, Zapn2 is the characteristic impedance value of the second transmission line branch, and η is the power allocation ratio of the output power of the second transmission line branch to the output power of the first transmission line branch; Z 0 is the characteristic impedance value of the input end of the power divider circuit. Before designing the power divider circuit, the power distribution ratio η of the output power of the second transmission line branch to the output power of the first transmission line branch and the characteristic impedance value Z of the input end can be set 0 , if η is 1, it means that the output power of the first transmission line branch is the same as the output power of the second transmission line branch, and then the characteristic impedance value of each transmission line branch can be calculated according to the impedance calculation formula.

[0074] The following is a description of the specific implementation methods:

[0075] For example, if you design a 2.4GHz equal power divider circuit in a 50 ohm system, that is, Z 0 The value of is 50 ohms, the operating frequency f of the power divider circuit is 2.4 GHz, and the parameters of the first transmission line branch and the second transmission line branch are the same.

[0076] First, according to Determine the power allocation ratio, where P 3 is the output power value of the second output end of the power divider circuit, P 2 is the output power value of the first output terminal; in this embodiment, since P 3 Equal to P 2 , that is, η is equal to 1;

[0077] according to Determine the values ​​of the first load 202 and the second load 203, wherein R2 is the resistance value of the first load 202, and R3 is the resistance value of the second load 203; in this embodiment, R 2 =R 3 =50Ω;

[0078] according to Determine the value of the isolation resistor 201, where R is the resistance value of the isolation resistor 201; in this embodiment,

[0079] According to the impedance calculation formula, we can get

[0080] Set at the operating frequency f, Among them, Φ apn1 represents the preset phase shift value of the first transmission line branch, Φ apn2 represents a preset phase shift value of the second transmission line branch;

[0081] According to the above formula, we can get Among them, Q apn1 represents the preset tuning coefficient value of the first transmission line branch, Q apn2 represents the preset tuning coefficient value of the second transmission line branch, C p，apn1 represents the capacitance value of the series capacitor in the first transmission line branch, C p，apn2 represents the capacitance value of the series capacitor in the first transmission line branch, and the capacitance value of the series capacitor in the transmission line branch can be determined by setting a preset tuning coefficient;

[0082] Set Q apn1 =Q apn2 =0.06, the parameters in the first transmission line branch and the second transmission line branch are the same, specifically:

[0083]

[0084] Thus, the design of the power divider circuit is completed; Figure 5 Insertion loss experiment result diagram provided by the embodiment of the present invention; Figure 6 A graph showing the input return loss experimental results provided by an embodiment of the present invention; Figure 7 The output isolation test result diagram provided by the embodiment of the present invention; Figures 5 to 7, wherein the first curve 301 represents the insertion loss of the power divider circuit provided by the embodiment of the present invention, and the first comparison curve 302 represents the insertion loss of the existing power divider; the second curve 401 represents the input end return loss of the power divider circuit provided by the embodiment of the present invention, and the second comparison curve 402 represents the input end return loss of the existing power divider; the third curve 501 represents the isolation of the power divider circuit provided by the embodiment of the present invention, and the third comparison curve 502 represents the isolation of the existing power divider; from Figures 5 to 7 It can be seen that the power divider circuit of the embodiment of the present invention can push the harmonic point to about 14 GHz. Since the frequency of the harmonic point is relatively high, the power divider circuit has no harmonic point within the effective working bandwidth of the power divider circuit (such as below 12 GHz), that is, the power divider circuit of the embodiment of the present invention can suppress the harmonic point; while the traditional power divider has the problem of harmonic leakage at the third harmonic (7.2 GHz) and fifth harmonic (12 GHz) of the working frequency (2.4 GHz).

[0085] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A power divider circuit, characterized in that: The power divider circuit comprises: at least two transmission line branches; The first ends of the at least two transmission line branches are electrically connected to the input end of the power divider circuit, and the second ends of the transmission line branches are electrically connected to at least two output ends of the power divider circuit in a one-to-one correspondence; At least one of the transmission line branches comprises a transmission line circuit, the transmission line circuit comprising: a first coupled inductor, a second coupled inductor, a series capacitor and a parallel capacitor, the first coupled inductor and the second coupled inductor being mutually coupled; The first end of the first coupling inductor is electrically connected to the first end of the shunt capacitor and then electrically connected to the first end of the transmission line branch; the second end of the first coupling inductor is electrically connected to the first end of the series capacitor, and the second end of the series capacitor is grounded; the first end of the second coupling inductor is electrically connected to the second end of the shunt capacitor and then electrically connected to the second end of the transmission line branch, and the second end of the second coupling inductor is electrically connected to the first end of the series capacitor; The series capacitor, the parallel capacitor, the first coupled inductor, the second coupled inductor, and the series capacitor satisfy the following relationship: C S =QC P ; Among them, the Z apn is the preset characteristic impedance value of the transmission line branch, Q is the preset tuning coefficient value; C p is the capacitance value of the parallel capacitor, the C s is the capacitance value of the series capacitor; L is the inductance value of the first coupled inductor and the second coupled inductor; k is the coupling coefficient between the first coupled inductor and the second coupled inductor; Φ is the preset phase shift value of the transmission line branch; f is the operating frequency of the power divider circuit; The parallel capacitor is a variable capacitor.

2. The power divider circuit according to claim 1, characterized in that: The at least two transmission line branches include a first transmission line branch and a second transmission line branch; each of the transmission line branches includes a transmission line circuit.

3. The power divider circuit according to claim 2, characterized in that: An isolation resistor is also included, wherein a first end of the isolation resistor is electrically connected to the second end of the first transmission line branch, and a second end of the isolation resistor is electrically connected to the second end of the second transmission line branch.

4. A power divider, characterized in that: The invention comprises the power divider circuit as described in any one of claims 1 to 3.

5. A method for designing a power divider circuit, characterized in that: The power divider circuit comprises: two transmission line branches, a first transmission line branch and a second transmission line branch; the first end of each of the transmission line branches is electrically connected to the input end of the power divider circuit, and the second end of each of the transmission line branches is electrically connected to the two output ends of the power divider circuit in a one-to-one correspondence; each of the transmission line branches comprises a transmission line circuit, and the transmission line circuit comprises: a first coupling inductor, a second coupling inductor, a series capacitor and a parallel capacitor, and the first coupling inductor and the second coupling inductor are mutually coupled; the first end of the first coupling inductor is electrically connected to the first end of the parallel capacitor and then electrically connected to the first end of the transmission line branch; the second end of the first coupling inductor is electrically connected to the first end of the series capacitor, and the second end of the series capacitor is grounded; the first end of the second coupling inductor is electrically connected to the second end of the parallel capacitor and then electrically connected to the second end of the transmission line branch, and the second end of the second coupling inductor is electrically connected to the first end of the series capacitor; The method comprises: determining an operating frequency of the power divider circuit, a preset characteristic impedance value, a preset phase shift value, and a preset tuning coefficient value of the first transmission line branch and the second transmission line branch; Determine the capacitance value of the parallel capacitor of the transmission line branch, the capacitance value of the series capacitor, the inductance values ​​of the first coupled inductor and the second coupled inductor, and the coupling coefficient between the first coupled inductor and the second coupled inductor according to the characteristic impedance value, the preset phase shift value, the tuning coefficient value and a preset formula; The preset formula includes: C S =QC P ; Among them, the Z apn is the preset characteristic impedance value of the transmission line branch, Q is the preset tuning coefficient value; C p is the capacitance value of the parallel capacitor, the C s is the capacitance value of the series capacitor; L is the inductance value of the first coupled inductor and the second coupled inductor; k is the coupling coefficient between the first coupled inductor and the second coupled inductor; Φ is the preset phase shift value of the transmission line branch; f is the operating frequency of the power divider circuit.

6. The method for designing a power divider circuit according to claim 5, characterized in that: The characteristic impedance value of the first transmission line branch and the characteristic impedance value of the second transmission line branch are obtained by the characteristic impedance value of the input end of the power divider circuit, the power distribution ratio of the output power of the second transmission line branch to the output power of the first transmission line branch, and an impedance calculation formula.

7. The method for designing a power divider circuit according to claim 6, characterized in that: The impedance calculation formula is: Among them, the Z apn1 is the characteristic impedance value of the first transmission line branch, the Z apn2 is the characteristic impedance value of the second transmission line branch, η is the power distribution ratio of the output power of the second transmission line branch to the output power of the first transmission line branch; and Z0 is the characteristic impedance value of the input end of the power divider circuit.

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